【英文标准名称】:StandardTestMethodforTotalOxygenDemandinWater
【原文标准名称】:水中总氧要求的标准试验方法
【标准号】:ASTMD6238-1998(2003)
【标准状态】:现行
【国别】:
【发布日期】:1998
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D19.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:试验室分析;生产线检测;总氧要求;需氧量;鳕鱼
【英文主题词】:BOD;COD;laboratoryanalyzer;onlinemonitor;oxygendemand;totaloxygendemand;TOD
【摘要】:Themeasurementofoxygendemandparametersiscriticaltothecontrolofprocesswastewaters.Biochemicaloxygendemand(BOD)andchemicaloxygendemand(COD)analyzershavelongtimecyclesandinthecaseofCODanalyzersusecorrosivereagentswiththeinherentproblemofdisposal.Totaloxygendemandanalysisisfaster,approximately3min,andusesnoliquidreagentsinitsanalysis.TODcanbecorrelatedtobothCODandBOD,providingeffectiveon-linecontrol.TODoffersseveralfeatureswhichmakeitamoreattractivemeasurementthancarbonmonitoringusingTotalCarbon(TC)orTotalOrganicCarbon(TOC)analyzers.TODisunaffectedbythepresenceofinorganiccarbon.TODanalysiswillalsoindicatenoncarbonaceousmaterialsthatconsumeorcontributeoxygen.Forexample,theoxygendemandofammonia,sulfiteandsulfideswillbereflectedintheTODmeasurement.Also,sincetheactualmeasurementisoxygenconsumption,TODreflectstheoxidationstateofthechemicalcompound(thatis,ureaandformicacidhavethesamenumberofcarbonatoms,yetureahasfivetimestheoxygendemandofformicacid).1.1Thistestmethodcoversthedeterminationoftotaloxygendemandintherangefrom100to100000mg/L,inwaterandwastewaterincludingbrackishwatersandbrines(see6.5).Largerconcentrations,orsampleswithhighsuspendedsolids,orboth,maybedeterminedbysuitabledilutionofthesample.1.1.1Sincetheanalysisisbasedonthechangeinoxygenreadingofthecarriergascomparedtothatwhenasampleisintroduced(see4.1),themeasurementrangeisafunctionoftheamountofoxygeninthecarriergas.Thehigherthedesiredconcentrationrange,themoreoxygenrequiredinthecarriergas.Underrecommendedconditions,thecarriergasconcentrationshouldbebetweentwotofourtimesthemaximumdesiredoxygendemand.1.1.2Thelowermeasurementrangeislimitedbythestabilityofthebaselineoxygendetectoroutput.Thissignalisafunctionofthepermeationsystemtemperature,carriergasflowrate,oxygendetectortemperature,andreferencesensorvoltage.Combined,thesevariableslimittheminimumrecommendedrangeto2to100mg/L.1.1.3Theuppermeasurementrangeislimitedbythemaximumoxygenconcentrationinthecarriergas(100%).Withtherecommendedconditionsofcarriergasconcentrationbeingtwotofourtimesthemaximumoxygendemand,thislimitsthemaximumpossibleoxygendemandtobetween250000to500000mg/L.However,asapracticalapplicationtowateranalysis,thistestmethodwillconsideramaximumrangeof100000mg/L.1.2Thistestmethodisapplicabletoalloxygen-demandingsubstancesundertheconditionsofthetestcontainedinthesamplethatcanbeinjectedintothereactionzone.Theinjectoropeninglimitsthemaximumsizeofparticlesthatcanbeinjected.Ifoxygen-demandingsubstancesthatarewater-insolubleliquidsorsolidsarepresent,apreliminarytreatmentmaybedesired.ThesepretreatmentmethodsaredescribedinAnnexA2.1.3Thistestmethodisparticularlyusefulformeasuringoxygendemandincertainindustrialeffluentsandprocessstreams.Itsapplicationformonitoringsecondarysewageeffluentsisnotestablished.ItsuseforthemonitoringofnaturalwatersisgreatlylimitedbytheinterferencesdefinedinSection6.1.4Inadditiontolaboratoryanalysis,thistestmethodisapplicabletoon-streammonitoring.SampleconditioningtechniquesforsolidspretreatmentapplicationsarenotedinAnnexA2.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicability......
【中国标准分类号】:Z16
【国际标准分类号】:13_060_50
【页数】:7P.;A4
【正文语种】:
基本信息
标准名称: | 压力容器公称直径 |
英文名称: | Nominal diameter of pressure vessels |
中标分类: |
机械 >>
通用机械与设备 >>
压力容器 |
ICS分类: |
流体系统和通用件 >>
流体存储装置 >>
压力容器、气瓶
|
替代情况: | GB/T 9019-1988 |
发布部门: | 国家质量技术监督局 |
发布日期: | 2001-02-13 |
实施日期: | 2001-10-01 |
首发日期: | 1988-04-16 |
作废日期: | 1900-01-01 |
主管部门: | 国家标准化管理委员会 |
提出单位: | 全国压力容器标准化技术委员会 |
归口单位: | 全国锅炉压力容器标准化技术委员会 |
起草单位: | 中国环球化学工程公司 |
起草人: | 费伟、邱文炳 |
出版社: | 中国标准出版社 |
出版日期: | 2001-10-01 |
页数: | 平装16开, 页数:2, 字数:3千字 |
书号: | 155066.1-17666 |
适用范围
本标准规定了压力容器的公称直径系列尺寸。本标准适用于圆筒形压力容器及常压容器。本标准不适用于气瓶。
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所属分类: 机械 通用机械与设备 压力容器 流体系统和通用件 流体存储装置 压力容器 气瓶